
x = input()
x = int(x)

if  30<=x:
    
    print("Yes")
    
else :
    print("No") x = input() x input() input x = int(x) x int(x) int x if  30<=x:
    
    print("Yes")
    
else :
    print("No") 30<=x 30 x print("Yes") print "Yes" print("No") print "No" x = int(x) int(x) x x = input() input() x

x = input()
x = int(x)

if  30<=x:
    
    print("Yes")
    
else :
    print("No")